CN108350818A - Lean burn ic engine delivery temperature controls - Google Patents

Abstract

Disclose a variety of method and arrangements for skipping the delivery temperature of ignition control internal combustion engine for controlling lean-burn.In an aspect, engine controller includes after-treatment system monitor and ignition timing determination unit.The post-processing monitor obtains the relevant data of temperature with one or more after-treatment components, such as catalyst.It is based at least partially on this data, which generates for skip the ignition order that sparking mode operates the engine, so that the temperature of the after-treatment component is controlled in its effective opereating specification.

Description

Lean burn ic engine delivery temperature controls

Cross reference to related applications

This application claims the priority for the U.S. Provisional Application No. 62/254,049 that on November 11st, 2015 submits, the U.S. Provisional application is incorporated herein in its entirety by quoting.

Technical field

The present invention relates to a kind of igniter motor control system is skipped for internal combustion engine.More precisely, of the invention It is related to for controlling delivery temperature to improve arrangement and the method for the effect of emission control systems.

Background technology

Most of vehicles in current practices provide power by internal combustion (IC) engine.Internal combustion engine typically has more A cylinder or in which other operating rooms burnt.The power generated by engine depends on the combustion for being delivered to each operating room The amount of material and air.Engine must be operated in large-scale service speed and torque output load to adapt to daily traveling Needs.

There are the I/C engines of two kinds of type of foundation：Spark ignition engine and compression ignition engine.In the former, combustion Burning is to be caused by spark, and in the latter, burning is caused by temperature associated with compression work room charge increase 's.Compression ignition engine can be categorized further, as stratified charge compression ignition engine (for example, most conventional diesel engine Machine, and be abbreviated as SCCI), premixed charge compression ignition (PCCI), reactivity control compression ignition (RCCI), gasoline compression point Fiery engine (GCI or GCIE) and homogeneous charge compression ignition (HCCI).Some diesel engines, particularly than older Diesel engine generally controlled into the air mass flow in engine without using throttle valve.Spark ignition engine is overall On with the fuel/air rate of certain stoichiometry carry out operation and by control operating room in quality air charge (MAC) To control its output torque.Quality air charge is generally using throttle valve control to reduce intake manifold absolute pressure (MAP). Compression ignition engine is typically via the amount (therefore changing air/fuel stoichiometry) for controlling sprayed fuel rather than wears The air mass flow of engine is crossed to control engine output.Engine output torque to the air for entering operating room by adding more Even if few fuel, engine run to reduce thinlyyer.For example, compared to the stoichiometric air/fuel ratio of approximation 14.5, Diesel engine can be operated typically with 20 to 55 air/fuel ratio.

The fuel efficiency of internal combustion engine can substantially be improved by changing engine displacement.This allows when needed Torque capacity is can get, pumping loss can also be significantly decreased by using more small displacement when not needing torque capacity And improve the thermal efficiency.Realize that the most common process of modulated displacement engine is essentially simultaneously deactivated one group of cylinder now. In this method, when wishing to skip combustion incident, intake valve associated with institute's cylinder deactivation and air bleeding valve remain turned-off simultaneously And do not spray fuel.For example, 8 cylinder modulated displacement engines can deactivate the half (that is, 4 cylinders) in these cylinders, in this way So that it is operated using only remaining 4 cylinders.Commercially available modulated displacement engine obtained by now is typically only Support two kinds or at most three kinds discharge capacities.

Another engine control for changing the effective discharge of engine is referred to as the control of " skipping igniting " engine. Generally speaking, igniter motor control is skipped to be susceptible to be selectively skipped over the point of certain cylinders during selected ignition timing Fire.Therefore, specific cylinder can be ignited during an engine follows, and then in next engine cycles In be skipped and be selectively skipped or light a fire in next engine cycles.By this method, to effective engine The even more precise controlling of discharge capacity is possible.For example, lighting a fire to every three cylinders in 4 Cylinder engines will be provided up to most The 1/3 of big engine displacement effectively reduces, this is by simply deactivating one group of cylinder to form uniform ignition mode institute nothing The score discharge capacity that method obtains.

Spark ignition engine and compression ignition engine be required for include one or more after-treatment components discharge control For system processed to limit the discharge of be not intended to pollutant, these pollutants are combustion by-products.Catalyst and micro particle filtering Device is two kinds of common after-treatment components.Spark ignition engine generally uses 3 effect catalyst, which both aoxidized Unburned hydrocarbons and carbon monoxide and nitrogen oxides reduction (NO_x).These catalyst need engine combustion averagely to locate In or close to certain stoichiometry air/fuel ratio, so that oxidation and reduction reaction can be sent out in catalyst It is raw.Due to compression ignition engine it is generally thin run, they can not depend only on conventional 3 effect catalyst Meet emission regulation.Alternatively, they restore NO using another type of after-treatment device_xEmission.These post-processings Device can use catalyst, dilute NO_xNitrogen oxides is reduced into dinitrogen by trap and selective catalytic reduction (SCR). Most common SCR system passes through the forward direction engine exhaust of the catalyst based on SCR to add urine in engine exhaust flow Element/aqueous mixtures.In SCR element, urea decomposes ammonification, and ammonia is with the reaction of nitrogen oxides in SCR to form dinitrogen (N₂) With water (H₂O).Additionally, diesel engine usually needs particulate filter to reduce soot emissions.

In order to successfully limit emissions from engines, all after-treatment system elements are required for grasping in specific high temperature range Make more effectively to work.Since 3 effect catalyst are in the controlled spark ignition engine of wherein engine air capacity It uses, therefore maintains the sufficiently high engine exhaust temperature within the scope of 400C, it is effective in 3 effect catalyst to contribute to What pollutant removal was relatively easy to.Maintain the abundant delivery temperature in lean-combustion engine more difficult, because delivery temperature is What the excess air by flowing through engine reduced.In the presence of for lean-burn can be controlled within the scope of big engine operating condition The demand of the improved method and apparatus of the delivery temperature of engine.

Invention content

Describe the more of the temperature of the after-treatment component in the exhaust system for heating or controlling lean burn ic engine Kind method and arrangement.In an aspect, engine controller includes after-treatment component monitor and ignition timing determination unit. The after-treatment component monitor is arranged related to one or more after-treatment components, the temperature of such as catalyst to obtain Data.This data in the form of after-treatment component temperature model and/or can be related to the temperature to the after-treatment component Degree is directly measured or is sensed.The ignition timing determination unit determine for skip sparking mode operate the engine these The ignition order of operating room.The ignition order is based at least partially on the after-treatment component temperature data.

Some realization methods are related to one kind and skipping igniter motor control system, this skips igniter motor control system sound Igniting score or ignition order, these conditions and engine parameter packet should be dynamically adjusted in a variety of conditions and engine parameter Include oxygen sensor data, NO_xSensing data, delivery temperature, atmospheric pressure, ambient humidity, environment temperature and/or catalysis turn Parallel operation temperature.In different embodiments, ignition order is determined by ignition timing.

In another aspect, a kind of lean-burn internal combustion hair of the operation in Cold Start with multiple operating rooms is described The method of motivation.This method includes：Deactivate at least one operating room, so that be pumped across the operating room without air； Obtain the relevant data of temperature with the element in after-treatment system；And it determines and starts for operating this to skip sparking mode The ignition order of these operating rooms of machine.The ignition order is at least partially based on post-processing temperature data generation.

Description of the drawings

In conjunction with the accompanying drawings with reference to following explanation can be best understood the present invention and its advantage can, in the accompanying drawings：

Figure 1A is the schematic diagram of the representative engine exhaust system for exemplary compression ignition engine.

Figure 1B is the schematic diagram of the representative engine exhaust system of replacement for exemplary compression ignition engine.

Fig. 2 is curve graph of the delivery temperature to engine loading of exemplary compression ignition engine.

Fig. 3 be according to a particular embodiment of the invention skip retrofire machine controller.

Fig. 4 is curve graph of the delivery temperature to engine loading of exemplary compression ignition engine, compression ignition hair What motivation was skipped that cylinder is deactivated wherein skip is operated under ignition control.

Fig. 5 is curve graph of the delivery temperature to engine loading of exemplary compression ignition engine, compression ignition hair Motivation is skipped skipping for cylinder pumped air and is operated under ignition control wherein.

Fig. 6 is the prior art representation with the after-treatment component temperature in a part for driving pattern in Cold Start Curve graph.

Fig. 7 is using the after-treatment component temperature in the Cold Start for skipping ignition control and in a part for driving pattern The representative curve figure of degree.

In the accompanying drawings, identical reference label is occasionally used for specifying identical structural detail.It should also be appreciated that in attached drawing Description be it is graphic rather than in proportion.

Specific implementation mode

The present invention relates to a kind of retrofire is skipped for internal combustion engine (and particularly, lean burn ic engine) Machine control system.More precisely, the present invention relates to for controlling delivery temperature to improve the arrangement of the effect of emission control systems And method.In different embodiments, by ignition timing or using Σ-δ or equally δ-Σ converters ignition order is determined. It is this skip Iganition control system can be defined as dynamic skip ignition control.

Igniter motor control is skipped to be susceptible to be selectively skipped over the point of certain cylinders during selected ignition timing Fire.Thus, for example, specific cylinder can be ignited during an ignition timing and then can be in next igniting It is skipped during machine, and is then optionally skipped or lights a fire during next ignition timing.This can with routine Variable-displacement engine operation is contrasted, in conventional variable displacement power operation, in the mistake of certain low-load operating conditions Fixed one group of cylinder is deactivated in journey.In skipping ignition operation, it dynamically, for example by ignition timing can make igniting and determine It is fixed, although this is not required.

For wherein can be by being operable to reduce the spark ignition of pumping loss under higher average MAP levels Engine, different advantages, including the substantial improvements in terms of fuel economy can be provided by skipping igniter motor control.Due to pressure Contracting igniter motor is typically not to be run under low manifold pressure, therefore for such engine, skip a little Fire control system does not make pumping loss substantially reduce.It is provided in big engine operating condition range however, skipping ignition control The means of interior control engine exhaust temperature.Specifically, it skips ignition control to can be used for increasing delivery temperature, so that should Temperature generally maintains in the range of post-processing emission control systems can efficiently reduce tailpipe object.Gently loading Under, for example, under the load of less than 1 bar BMEP (brake mean-effective pressure), skipping ignition control can be such that compression ignition sends out The efficiency of motivation improves 10%.

Figure 1A is exemplary lean-combustion engine and the schematic diagram of exhaust system.Engine 111, which has, wherein to burn Several operating rooms or cylinder 114.Exhaust from combustion process leaves cylinder 114 by exhaust manifold 102.Exhaust system 103a Including one or more after-treatment components to reduce the discharge in harmful substance to environment.These elements may include particle mistake Filter 104, oxidation catalytic converter 106, reductant injection system 108 and reduction catalysts converter 113.After these differences Processing element or device can be collectively referred to as after-treatment system.The removal of particulate filter 104 is likely to be present in exhaust stream Particle matter, i.e. cigarette ash.Oxidation catalytic converter 106 aoxidizes unburned hydrocarbons and carbon monoxide in exhaust stream.By It is generally operated under lean air/fuel ratio in engine 111, therefore there is generally sufficient oxygen in exhaust stream To aoxidize these imperfect combustion products.Reductant injection system 108 draws reducing agent (the often mixture of urea and water) Enter into waste stream.Nitrogen oxides can be reduced by reduction catalysts converter 113 using selective catalytic reduction (SCR) Dinitrogen and water.Reduction catalysts converter 113 can use two kinds of catalyst.First catalyst 110 is used for will be in reducing agent 108 Urea be changed into ammonia, and the second catalyst 112 is used to nitrogen oxides and ammonia being changed into dinitrogen and water.Across reduction After catalyst 113, exhaust stream leaves exhaust system 103a via tail pipe 124 and enters in environment.In exhaust system 103a Different after-treatment components fully can remove noxious pollutant from exhaust stream, so that exhaust stream and existing environmental legislation It is compatible.

In addition exhaust system 103a may include one or more sensors.For example, oxygen sensor 109a and 109b can To be accordingly placed on before and after oxidation catalytic converter 106.NO_xSensor 117 can be located at reduction catalysts converter 113 downstreams.One or more temperature sensors can also merge in exhaust system 103a.Definitely, it can exist for monitoring The temperature sensor 107 of the temperature of oxidation catalytic converter 106, for monitoring particulate filter 104 temperature temperature sensing The temperature sensor 115 of device 105 and temperature for monitoring reduction catalysts converter 113.Other sensor (Figure 1A or Figure 1B is not shown), the temperature sensor in such as exhaust manifold can be merged into exhaust system.

In order to make the after-treatment component in exhaust system be properly acted, they need to grasp in certain high temperature range Make.Specifically, the catalyst in 113 the two of oxidation catalytic converter 106 and reduction catalysts converter is required for relatively narrow Operation in temperature range.The representative operation range of reducing catalyst can be between 200C and 400C, although other are catalyzed Agent can have different range.Oxidation catalyst can have wider and higher opereating specification in a way.Oxidation is urged Agent is placed on the exhaust that reducing catalyst upstream causes oxidation catalyst to be generally exposed to higher temperature, because gas has The less time comes cooling in exhaust system.Generally speaking, the after-treatment component in exhaust system can be arranged so that Element with higher operating temperature range is than other elements closer to engine.This allows the first after-treatment component, for example schemes The particulate filter 104 of 1A undergoes maximum temperature exhaust stream.Unless from heat-producing chemical reaction, from outer in any after-treatment device Portion's heat source, the oxidation of unburned hydrocarbons discharge notable energy from some other heat sources, and otherwise exhaust stream will be worn at it It crosses generally cooling when the subsequent element in exhaust pathway.

The temperature of after-treatment component by generally close to the temperature of the exhaust across it, although in some cases, by The heat-producing chemical reaction that catalyst promotes can increase the temperature of exhaust.Generally speaking, exhaust will pass through exhaust system at them When cooled down due to being transmitted from the heat in exhaust system component and pipeline to environment, although unburned or partially combusted fuel Delivery temperature can be increased by continuing oxidation.This oxidation can occur within an exhaust-gas stream or on oxidation catalyst.Compared to wearing The mass rate of flow of the exhaust of catalyst is crossed, the quality of after-treatment system catalyst is also relatively large, therefore typically makes to urge The temperature of agent will be spent several minutes with the equalized temperature for flowing through its exhaust.

It should be appreciated that the order of the element in after-treatment system can be changed.Arrangement shown in figure 1A is for wherein particle Filter 104 do not need activity cleaning or regenerative process system for can be appropriate.Figure 1B shows that replacement is representative Exhaust system 103b.It is between this system and exhaust system 103a shown in figure 1A the difference is that different after-treatment components are being arranged Order in air-flow.In fig. ib, oxidation catalytic converter 106 is placed on the upstream of particulate filter 104.Work as particulate filter 104 need by making its temperature rise to about 500C or 600C to burn out the master of the soot accumulated on particulate filter 104 When dynamic process periodically is cleaned, this arrangement can be advantageous.Active cleaning process may include：By unburned nytron Object is introduced into exhaust stream, and is converted into heat by being aoxidized to them in oxidation catalytic converter 106 Amount.By the way that oxidation catalytic converter 106 is located in 104 upstream of particulate filter, can be actively controlled during cleaning Particulate filter temperature.Alternatively, particulate filter 104 can be located at 113 downstream of reduction catalysts converter.After-treatment component Order can be changed according to its operating temperature range and maximum permissible temperature.

Other unshowned different features of Figure 1A and Figure 1B and element can be merged into exhaust system.This class component can be with Including but not limited to exhaust gas recycling system (EGR), for turbocharger provide power turbine and for controlling Across the waste gate of the extraction flow of turbine.

Fig. 2 shows exhaust manifold (Figure 1A and the figures of the representative boosting compression ignition engine operated at 1250rpm 102 in 1B) delivery temperature at loads power operation.Curve 280 is indicated in all engine cylinders all substantially The delivery temperature become with engine loading in the case of lighting a fire under the same conditions, the engine loading is to brake average effective Pressure (BMEP) is expressed.Engine output is generally controlled by changing the amount of sprayed fuel, although such as fuel sprays Engine output may be influenced by penetrating other engine parameters such as timing and exhaust gas recirculatioon.It is essentially all in air charge In the case that oxygen all consumes in combustion, highest output loading is with stoichiometric air fuel than associated.It is lower Output loading correspond to thinner air/fuel ratio and change the timing of fuel injection.Shadow region is also used as in Fig. 2 270 show the operating temperature range for the engine exhaust temperature for realizing effective post-processing operation.Effective temperature scope can be by SCR catalyst limitation in reduction catalysts converter 113, SCR catalyst usually have than oxidation catalyst and particulate filter More limited operating temperature range.The discribed shadow regions 270 Fig. 2 have the opereating specification of about 200C, and 200C is representative value. SCR catalyst needs to maintain in this temperature range, to make after-treatment system effectively remove NO from exhaust stream_x.One In the case of a little, if SCR catalyst, in its operating temperature range, other after-treatment components are in its respective operations range It is interior.In this case, the temperature operating ranges of SCR catalyst indicate the temperature operating ranges of entire after-treatment system.If Other after-treatment components in exhaust system have different or narrower operating temperature range, then the discribed operation temperature of Fig. 2 Degree range 270 may need to change.

It should be appreciated that the discribed opereating specifications of Fig. 2 270 need not be the operating temperature range of catalyst, but it is exhaust Exhaust in manifold causes catalyst to be in the temperature range in its operating temperature range.For example, SCR catalyst operation temperature model It can be 200C to 400C to enclose, and is vented and can cool 25C before reaching catalyst.Therefore, shadow region 270 indicates The exhaust temperature ranges of approximate 225C to 425C.Different power operation points and engine design can be in delivery temperatures and SCR There are different steady-state offsets between the temperature of other catalyst in catalyst or after-treatment system.In some cases, it is vented Temperature can rise in exhaust system due to heat-producing chemical reaction.Above in relation to catalyst temperature opereating specification and catalysis The value that offset temperatures between agent and exhaust manifold gas temperature provide only is representative, and should not be construed as limited to this The range of invention.

Examination instruction to Fig. 2：Delivery temperature only falls into effective NO in about half of engine operating range_xRemoval In tolerance interval.Advantageously, the engine that igniter motor control can be used for being undergone in typical travel recycles is skipped Most of interior control delivery temperature of service load range, so that after-treatment system temperature is maintained at its operation temperature window It is interior.Specifically, one or more cylinders are deactivated so that being pumped without air during operation circulation to increase across cylinder Leave the mean temperature of the exhaust of engine.Cylinder can by cylinder deactivation intake valve, cylinder discharge valve or two kinds of valves come It deactivates.Effectively cutting off cylinder causes to have less air to dilute through the thermal exhaust generated that burns.Specifically, igniting is skipped Control can be used for making under low load conditions the temperature rise of exhaust stream.

Referring initially to Fig. 3, will describe according to an embodiment of the invention to skip retrofire machine controller 200.Hair Motivation controller 200 include igniting interpolater 206, ignition timing determination unit 204, Train Parameters adjustment module 216, Ignition control unit 240 and post-processing monitor 202.Ignition control unit 240 from ignition timing determination unit 204, it is rear from It manages monitor 202 and Train Parameters adjustment module 216 receives the operating room inputted and based on that input pipe haircut motivation Operation.

Any suitable module of the relevant data of temperature of the post-processing expression of monitor 202 acquisition and after-treatment component, Mechanism and/or sensor.Temperature can correspond to reduction catalysts converter 113, oxidation catalytic converter 106 or particulate filter The temperature of 104 (see Figure 1A and Figure 1B).If reduction catalysts converter has the most narrow opereating specification of any after-treatment component, that The data for indicating its temperature can be used only.In different embodiments, for example, post-processing monitor 202 may include coming from The oxygen sensor data of oxygen sensor 109a and/or 109b.Post-processing monitor can also include coming to be placed on reduction NO before and after catalyst 113_xThe measured value of sensor.It can also includes such as environment to post-process monitor 202 The inputs such as delivery temperature, atmospheric pressure, ambient humidity and/or engine coolant temperature in air themperature, exhaust manifold.Temperature Degrees of data can be obtained using one or more sensors, such as temperature sensor 105,107 and 115.In some embodiments In, engine controller 200 and post-processing monitor 202 need not carry out the temperature of after-treatment component directly to measure or feel It surveys.Alternatively, it can be post-processed using algorithm, such as catalytic converter temperature model using one or more input to determine Element or system temperature.Model be based on it is representative or with the relevant above parameter of catalytic converter temperature (for example, oxygen biography Sensor data, NO_xOne or more of sensing data, delivery temperature, environment temperature, atmospheric pressure, ambient humidity etc.). In some embodiments, the combination of temperature model can be combined with measured temperature value so as to temperature data.Specifically, mould Type can be used for predicting the after-treatment component temperature under transient state (as the transformation between engine start or engine loading). In which case it is possible to use controlling the temperature of after-treatment component based on the control system of feedforward.In other embodiment again In, it post-processes 202 direct estimation of monitor or senses the temperature of catalytic converter temperature or the other elements in after-treatment system. After-treatment system temperature data is transferred to Train Parameters adjustment module 216 by post-processing monitor 202, ignition timing determines list Member 204, ignition control unit 240 and/or igniting interpolater 206.

Other than post-processing monitor temperature data, igniting interpolater 206 receives the defeated of the desired torque of instruction Enter signal 210 or other control signals.Signal 210 can from accelerator pedal position sensor (APP) or other suitable sources, Cruise control, torque controller etc. are received or are obtained.

Based on the above input, igniting interpolater 206 is arranged to skip igniting igniting score (that is, being ordered to determine Igniting score 223).The desirable output of delivering and the post-processing member lighted a fire under current (or commander) operating condition of score instruction The percentage of igniting required by part temperature.In some cases, igniting score can be based on delivering desirable output with after The percentage of optimization igniting required by processing element temperature determines (for example, when operating room is fully optimizing for fuel efficiency Operating point down-firing when).It should be appreciated that igniting score can be conveyed or indicated with diversified mode.For example, igniting Score can take igniting pattern, sequence or any other firing characteristic for being related to or inherently conveying above-mentioned igniting percentage Form.

Igniting interpolater 206 indicates the diversified ginseng of after-treatment component temperature in view of possible influence or help Number.Come that is, igniting score is based at least partially on the after-treatment component temperature data received from post-processing monitor 202 It determines.In certain methods, igniting score is based on the direct measurement to after-treatment component.Additionally, other letters can be used It ceases to determine igniting score, other information is for example：Oxygen sensor data, NO_xSensing data, ambient air temperature, exhaust Temperature, catalyst temperature, atmospheric pressure, ambient humidity, engine coolant temperature etc..In different embodiments, due to these Parameter changes with the passing of time, therefore can dynamically adjust igniting score in response to these variations.

Method for generating igniting score can need widely to change according to specific application.In a kind of ad hoc approach In, generate igniting score based in part on the time.That is, generating preliminary igniting fractional value, opened according to from engine It is dynamic to start elapsed time amount to adjust the preliminary igniting fractional value in a predetermined manner.It is then possible to more than being based on Parameter (such as, ambient air temperature, delivery temperature, catalyst temperature, NO_xSensing data, and/or oxygen sensor data) Any of further adjust provisional value using algorithm.In different embodiments, it is known that some igniting scores are in specific vehicle Or engine design in undesirable noise, vibration and injustice can be caused pliable (NVH), and can adjust or avoid and is such Igniting score.In other embodiment again, divided from the igniting with acceptable NVH characteristics based on after-treatment component temperature data Several predefined library selection igniting scores.After-treatment component temperature data can be obtained from after-treatment component temperature model, or can To be the after-treatment component temperature sensed.

In the shown embodiment, the Train Parameters adjustment module 216 cooperated with igniting interpolater 206 is provided.It passes Dynamic is that parameter adjustment module 216 commands ignition control unit 240 suitably to set selected Train Parameters, to ensure practical hair Motivation output is substantially equal to the institute's request engine output ordered under igniting score.By way of example, Train Parameters adjust Module 216 can be responsible for determining desirable fuel supply level, the quantity of fuel injection event, fuel injection timing, exhaust It recycles (EGR), and/or can wish to assist in ensuring that real engine output and other matched hairs of institute's request engine the output phase Motivation is arranged.Certainly, in other embodiments, Train Parameters adjustment module 216 can be arranged directly to control difference Engine is arranged.

In some realization methods of the present invention, Train Parameters adjustment module 216 is arranged in different operation modes Between transformation be skipped operating room.As pointed out earlier, it skips igniter motor operation and is related to lighting a fire the one of selected operating room A or multiple selected working cycles simultaneously skip others.In the first mode of operation, it is skipped operating room and follows being skipped work It is deactivated during ring, that is, within the duration of relevant work cycle, considerably less air or pass through corresponding work without air Make room.This pattern is realized by deactivating intake valve and/or the air bleeding valve of allow air to enter and leave operating room.If into Both air valve and air bleeding valve are closed, then gas is trapped in operating room, to be effectively formed pneumatic spring.

In this second mode of operation, the intake valve for being skipped operating room and air bleeding valve are in relevant work cyclic process Blow-by, and air is able to flow through the operating room.In this mode of operation, it is skipped in operating room and does not fire It burns, and is pumped and is delivered to exhaust system across the air for being skipped operating room.This is with diluted exhaust stream and reduces it The effect of temperature.Excessive oxygen is also introduced into exhaust stream by this.

In third operation mode, in the power stroke later stage, the intake valve and air bleeding valve that are skipped operating room are opened, and Fuel is injected into cylinder.The result is that by the unburned or combustion only slightly burnt being skipped in the exhaust stream of operating room's delivering Material.Unburned hydrocarbons enter oxidation catalytic converter and exothermic reaction occur with from the air for being skipped operating room. This reaction helps heated oxide catalyst.This method can be particularly useful during engine start cycle , in engine start cycle, oxidation catalytic converter needs rapidly to heat to make the discharge of pollutant minimize. In other embodiment, unburned hydrocarbons are for by making the temperature rise of particulate filter 104 to burn out soot accumulated It can be useful to carry out clean particulate filter.Although thinking introduces hydrocarbons into exhaust system in some cases It can be useful, but should generally avoid or minimized this practice, because it reduces fuel economy.

It should be appreciated that being skipped cylinder can be operated by any one of three kinds of operation modes, these three operation modes It deactivates, operation valve or spray fuel in a manner of being nearly free from burning in the case of no fuel injection.That is, Being skipped cylinder can be operated in a few thing cycle using disabling valve, and be grasped using operation valve on following cycle Make, and is operated using disabling valve in cycle later.Cylinder is skipped or is ignited also to be controlled in a dynamic fashion System.The control of this level allows to optimize air, oxygen and the unburned fuel being delivered in exhaust system by being skipped cylinder Amount.Be ignited cylinder generally generate comprising some residual oxygen (because these cylinders run generally thinly) and some The thermal exhaust of the unburned hydrocarbons of residual level.

Discharge in control engine starting process has technological challenge, because different after-treatment components have not yet been reached Its operation temperature.Initially since cold start-up, all engines and exhaust component are all cold.It may want to nominal chemical The air/fuel ratio of metering with relatively low igniting score starts engine in the case of lighting a fire to cylinder firings, and makes institute It is skipped cylinder and is in pattern one to avoid any air being pumped into oxidation catalytic converter.Once oxidation catalysis turns Parallel operation temperature is begun to ramp up, so that it may with by being skipped at least some of cylinder by oxygen with second or the third mode operation It is delivered to catalyst.It can be by running firing cylinder with enriched air/fuel ratio or via after being skipped cylinder Unburned hydrocarbons are delivered to oxidation catalytic converter by phase fuel injection at the same time, i.e., pattern three operates.Then, oxygen Can exothermic reaction occur in oxidation catalytic converter for gas and unburned hydrocarbons to increase its temperature more quickly. This reaction can only occur when oxidation catalytic converter is at or greater than hydrocarbon initiation temperature, and therefore may Once wishing that only oxidation catalytic converter reaches that temperature, oxygen and unburned hydrocarbons, which are just introduced into catalysis, turns Parallel operation.Once oxidation catalytic converter has reached its operation temperature, so that it may with by pattern three (across the later stage for being skipped cylinder Fuel injection) operation it is all be skipped cylinder, to make delivery temperature rise.It should be appreciated that by being supplied to oxidation catalyst Unburned fuel and oxygen come heated oxide catalyst also by heating in exhaust system be located at oxidation catalyst downstream other After-treatment component.These after-treatment components may include reducing catalyst and/or particulate filter.

In different realization methods, Train Parameters adjustment module 216 is arranged to be based on after-treatment component temperature data And/or other engine operation parameters cause engine to be converted between these three operation modes.For example, in certain methods, If engine controller determines the temperature of after-treatment component less than its effective operating temperature range but is higher than initiation temperature (example Such as, in Cold Start or under the conditions of extended low-load), then Train Parameters adjustment module can utilize third to grasp Operation mode (for example, the igniter motor of skipping for being related to unburned hydrocarbons being delivered to oxidation catalytic converter operates). This operation mode can help speed up is heated to desirable operation temperature by oxidation catalyst.However, if engine control Device processed determines that the temperature of oxidation catalyst is sufficiently high or has reached effective operating temperature range temperature, then Train Parameters tune Mould preparation block will transform to first operator scheme (for example, be related to lean air fuel mixture being delivered to be ignited operating room with And the deactivated igniter motor of skipping for being skipped operating room operates).

It is too high there is likely to be wherein catalyst temperature and need cooling situation.For example, compression ignition engine allusion quotation Couple with post-processing emission control element to type, the post-processing emission control element is slightly more narrower than spark ignition engine Operation in operation temperature band.In some cases, the temperature of after-treatment component can exceed that this band.Desirably avoid this Class situation, because the performance of after-treatment component may be damaged or be damaged to excessive temperature.Therefore, in some embodiments, start Machine controller makes the determination that certain threshold temperature whether is alreadyd exceed about after-treatment component.If situation is such, Outside air can be ejected into exhaust system before temperature is more than any after-treatment component of operating temperature range.Flowing Cooling post-processing emission control element will be helped across the additional air of exhaust system.Once engine controller determines post-processing The temperature of element is in desirable operation temperature band, so that it may to terminate outside air injection.

It should be appreciated that in some embodiments, different mode can be recycled applied to different operating.In other words, in spy In the selected working cycle process for determining operating room, operating room can be operated by second mode, and be followed in next work immediately In ring, relevant work room will operate in the first pattern.In other words, in a working cycles, being skipped operating room can allow Air passes through, and is being related to being skipped in next ignition timing immediately of operating room, and operating room is deactivated and seals.Air The variation of the delivering of fuel mixture and the operation of operating room's valve in response to exhaust system temperature data and/or a variety of can start Machine operating parameter dynamically changes from a working cycles to next working cycles and from an operating room to next operating room Become.

Ignition timing determination unit 204 is received from igniting interpolater 206 and/or Train Parameters adjustment module 216 Input, and be arranged to cause engine delivering by a system of the igniting percentage for ordering igniting score 223 specified to send out Row ignition order (for example, drive pulse signal 213).Ignition timing determination unit 204 can take diversified not similar shape Formula.For example, in some embodiments, ignition timing determination unit 204 can be implemented to wish using different types of inquiry table The control algolithm of prestige.In other embodiments, using Σ-δ converters or other mechanisms.It is defeated by ignition timing determination unit 204 A series of ignition orders (sometimes referred to as drive pulse signal 213) gone out can be sent to the point fire control of layout actual ignition Unit 240 processed.

Some realization methods are related to specific studio rather than the selectivity of other operating rooms is lighted a fire.For example, being opened from cold During the dynamic engine start cycle started, engine controller can only light a fire physically closer in exhaust system (having to the shorter exhaust stream path of after-treatment component) specific studio subgroup of after-treatment component.Due to coming from those The exhaust of operating room has a shorter travel path, therefore the less thermal energy of discharge loss and can help faster and more effectively Heat after-treatment component.At least one operating room can be deactivated, so that it is pumped across operating room without air, thus Make the temperature rise of exhaust, continue several working cycles.It can be positioned to away from being heated that this is at least one, which to be deactivated operating room, The farthest operating room of after-treatment component.

Engine controller 200, igniting interpolater 206, Train Parameters adjustment module 216 and ignition timing determine Unit 204 can take diversified different form and function.For example, disparate modules shown in Fig. 3 can be merged into less Component in or so that its feature is executed by greater amount of module.Other feature and module can be added to engine control Device.By way of example, some suitable igniting interpolaters, ignition timing determination unit, Train Parameters adjust module and its His associated modules are in commonly assigned U.S. Patent number 7,954,474；7,886,715；7,849,835；7,577,511；8, 099,224；8,131,445；8,131,447；9,086,020；With 9,120,478；U.S. Patent Application No. 13/774,134； 13/963,686；13/953,615；13/886,107；13/963,759；13/963,819；13/961,701；13/843,567； 13/794,157；13/842,234；13/004,839；It is described in 13/654,244 and 13/004,844, in these patents Each be incorporated herein in its entirety by quoting for all purposes.Any feature described in patent documents above, mould Block and operation can be added to controller 200.In different replacement realization methods, these functional blocks can use microprocessor, ECU or other computing devices, using analog or digital component, using programmable logic, using above-mentioned items combination and/or with Any other suitable mode is algorithmically realized.

Fig. 4 is shown with the representative boosting compression ignition engine operated at 1250rpm for skipping ignition control Exhaust manifold gas temperature to power operation load.Power operation is loaded with relative to the feelings all operated in all cylinders The BMEP of total engine displacement under condition is expressed.Fig. 4 shows a plurality of operating curve 410a to 410j.These curves correspond to Make engine with the different igniting score operations about cylinder deactivation, i.e. operations described above pattern one.Leftmost side curve 410a correspond to minimum igniting score, and rightmost side curve 410j correspond to highest light a fire score, that is, light a fire score be 1, institute There is cylinder all to light a fire.Intermediate curve 410b to 410i corresponds to successive higher igniting score.It is one corresponding to igniting score Curve 410j is identical with the corresponding portion of curve 280 shown in Fig. 2.Selected igniting score can correspond to offer can Receive the igniting score of NVH (noise, vibration and injustice are pliable) characteristic, such as commonly assigned 9,086,020 He of U.S. Patent number Described in Copending U.S. Patent Application Serial No. 13/963,686 and 14/638,908.Fig. 4 also shows shadow region 270, should Shadow region depicts the exhaust manifold gas promoted the after-treatment component in exhaust system to required by its operating temperature range Temperature.This region is identical with shadow region 270 shown in Fig. 2.

It, can be by by one in igniting score indicated in curve 410a to 410j in allowed operating area It is operable to generate required engine output, while engine exhaust temperature being maintained in required temperature limit. Under some cases, several igniting scores can deliver acceptable engine output and delivery temperature.It in these cases, can be with It is selected to provide the igniting score of most fuel efficient operation by igniting interpolater 206 (Fig. 3) to operate engine.To Fig. 4 Examination show：Using skipping the permitted steady state operation range of ignition control much larger than as shown in Figure 2 without this control Under respective range.For other engine speeds, similar operating curve 410a to 410j and exhaust manifold gas can be generated Temperature range 470.Generally speaking, the operation of modified igniting score skipped in ignition control will allow big engine Steady state operation in loading range.

As shown in figure 4, there is the high load condition range higher than 9.5 bars of BMEP of approximation, wherein engine can not be in stable state It is lower to carry out operation and maintain the element in after-treatment system within the scope of the temperature desired by it.These high loads are required to institute Have cylinder carry out operation and therefore no cylinder is skipped, that is, light a fire score be one.It under these conditions, can be by will be outer Boundary's air is ejected into exhaust system to reduce after-treatment system temperature, as described earlier.Moreover, being recycled in typical travel Under, engine is seldom operated within the extended period in this high load area.Since the heat of after-treatment system is lazy Property, the operation of the lasting short time period under this high load working condition (such as, when passing through or making the grade) generally will It is more than its operating temperature range not lead to after-treatment system.In these cases, need not apply to after-treatment system extraneous empty Gas, because it will be no more than its operating temperature range.

Allow starting greatly with the internally fired operation of compression ignition for skipping ignition control and deactivating and being skipped cylinder High exhaust temperature is maintained in machine opereating specification.High exhaust temperature for particulate filter (104 in Figure 1A and Figure 1B) generally It is advantageous, which can be a part for after-treatment system.Particulate filter 104 is maintained to promote at high temperature Into the oxidation of the soot particulates of retention in the filter.

Some particulate filters 104 require its to rise to about 500C to 600C Temperature cyclingly to remove on filter Soot accumulated, so that filter works again.This active temperature management process is to consume very much fuel.Even from Necessary every 200 miles to the 400 miles generations removing/regenerative processes of the size of filter, but the total losses in fuel economy can Can be significant.Skipping ignition operation can reduce or eliminate for regenerated demand, in the regeneration, particulate filter 104 It is heated to the cigarette ash of complete oxidation retention in the filter, to clean filter.It is micro- in the case where skipping ignition operation Grain filter can generally operate at a higher temperature, this reduces soot build-up rate, to extend between cleaning circulation Period.In some cases, skipping ignition control can be during initiative regeneration for temporarily deliberately making exhaust system temperature Degree rises with clean particulate filter 104.Unburned hydrocarbons will be introduced into exhaust stream by this clean method than depending on In clean method more fuel it is effective.

Fig. 5 is shown with the representative boosting compression ignition engine operated at 1250rpm for skipping ignition control Exhaust manifold gas temperature to power operation load.Fig. 5 is similar to Fig. 4, is only skipped cylinder and is not deactivated, but Their pumped air (patterns 2) in the case where not adding any fuel.Different curve 510a to 510j are indicated in different igniting The operation carried out under score.Digit-marker 510a to 510j indicates igniting score same as shown in Figure 4.Corresponding to being one Igniting score under the curve 510j and curve 410j of the operation that carry out and curve 280 it is identical.This is as described above Operation mode two.Shadow region 270 is identical with Fig. 2 and shadow region shown in Fig. 4, and indicates after-treatment system In element be heated in its operating temperature range required delivery temperature.The examination of Fig. 5 is shown：Relative to all cylinders It all lights a fire (shown in Fig. 2), not allow stable state behaviour to extending to the operation for being skipped the progress of pattern two that cylinder adds fuel The range effect for making condition is little.In some cases, some in pattern 2 are skipped operation (pumping) and the place of cylinder In pattern 1 some be skipped cylinder (being deactivated) for control delivery temperature can be useful.

Skipping particularly useful two operating areas of ignition control is gently being loaded in start-up course and under light load Under, the usually very thin operation of compression ignition engine.This is because due to gently loading, fuel flow rate is very low.Most of Than in older compression ignition engine, since these engines do not have throttle valve generally, can not further subtract Small air mass flow.Therefore, delivery temperature is for effective NO in catalyst_xIt there may come a time when for conversion too low.Some existing skills Art solution generates other heat using the injection in hydrocarbon to exhaust system in exhaust system, from And one or more after-treatment components are maintained in its desirable operating temperature range.This control method sacrifices fuel Economy.The needs to this hydrocarbon injection can be eliminated or at least significantly mitigate by skipping the use of ignition control.

Fig. 6 shows cold start-up and driving pattern of the after-treatment component 606 in prior art compression ignition engine Temperature in a part.Also shown is：Initiation temperature 602, i.e., some hydrocarbons in exhaust stream are by the temperature of spontaneous combustion Degree；And the lower boundary 604 of effective opereating specification of after-treatment component.In this drawing, initiation temperature is shown as 150C simultaneously And lower post-processing operation range is shown as 200C；However, these should be considered only as representative value, and in practice, it Can be bigger or smaller.

Driving pattern starts in the case where after-treatment component is in environment temperature (being assumed to be 20C).After-treatment component exists Time t₁Reach initiation temperature.Only after this time, post-processing will can be just made in hydrocarbon injection to exhaust stream The temperature rise of element.After-treatment component temperature continues rising, until time t₂Until, wherein after-treatment component reaches it effectively Opereating specification.In time t₂Before, after-treatment component is invalid for exhaust stream removal pollutant.After-treatment component is for going Depollution object is kept effectively, until time t₃Until, which indicates the extended low-load part of driving pattern.For t₃With t₄Between period, after-treatment component less than its opereating specification and for removal pollutant be invalid.

In order to reduce discharge, it is desirable to reduction reaches the startup time of its operation temperature until after-treatment component, and Reduce or eliminate the case where after-treatment component drops below its operation temperature in low-load conditioning process.Fig. 7, which is shown, to be made With the representative driving pattern of the present invention.Prior art after-treatment component temperature is shown as dotted line 606, this with it is shown in fig. 6 Post-processing temperature is identical.Initiation temperature 602 and the lower limit of after-treatment component operation temperature 604 such as Fig. 6.Curve 608 is described After-treatment component temperature.After-treatment component is set to reach the time of its operation temperature from t₂It is reduced to t_2’.Moreover, post-processing Element is in t₃With t₄Between the extended low-load period in maintain in its effective opereating specification.Engine controller can be tieed up It holds after-treatment component temperature and is slightly higher than its minimum operation temperature range, to be maintained above the buffering area of this value.Remain slow Rushing area helps prevent after-treatment component temperature to drop below after-treatment component in the case where engine loading further decreases Opereating specification.Compared with the prior art shown in fig. 6, when using the present invention shown in Fig. 7, the engine in driving pattern Discharge is therefore lower.

The present invention is mainly suitble to 4 strokes, compression ignition, the piston-mode motor that are used in electric vehicle in control Igniting background under be described.Compression ignition can use layered fuel charge, homogeneous fuel charge, part uniformly to fill The fuel charge of amount or some other types.It will be appreciated, however, that described ignition method of skipping particularly well is suitable for It is used in diversified internal combustion engine.These internal combustion engines include for the almost any type of vehicles (packet Include car, truck, ship, construction equipment, aircraft, motorcycle, trail bike etc.) and be related to the point of operating room and fight utilization The engine of the substantially any other application of internal combustion engine.

In some preferred embodiments, ignition timing determining module is converted using Σ-δ.Although it is believed that Σ-δ converters are non- Often it is well adapted to use in this application, it is to be understood that, diversified modulation scheme may be used in these converters.Example Such as, driving arteries and veins can be delivered using pulse width modulation, pulse-height modulation, the modulation towards CDMA or other modulation schemes Rush signal.Some in described embodiment utilize single order converter.However, in other embodiments, higher order can be used The library of converter or predetermined ignition order.

In other embodiments of the invention, intake valve and air bleeding valve control (are opened than the control of simple binary system Or close) more complicated.Variable elevation valve can be used, and/or can valve be adjusted by cam phaser and opened/closed just When.These actuators allow without using throttle valve and be associated pumping loss without it in the case of limitedly controls cylinder MAC. Advantageously, the adjustment of cylinder MAC is allowed to control fuel/air mixture stoichiometry for fixed fuel charge.Then, may be used To optimize burning condition to obtain improved fuel efficiency or in order to provide the desired condition in burning and gas-exhausting, i.e. oxygen water Flat, temperature etc..

Although several embodiments of the present invention are described in detail, it is to be understood that, the present invention can be without departing substantially from this Implemented in the form of many other in the case of the spirit or scope of invention.For example, drawings and examples describe specifically to pacify sometimes Row, operating procedure and control mechanism.It should be appreciated that these mechanisms and step can be appropriately modified to be suitble to the need of different application It wants.For example, the order of the different post-processing emission control elements in exhaust pathway shown in Figure 1A and Figure 1B can be changed.It can be with Using other after-treatment device, and the function of individual component can be attached in discrete component.Execution oxygen can be changed Change the method with reduction step；It is, for example, possible to use dilute NO_xTrap substitutes SCR catalyst.By NO_xAbsorber/NO_xTrap The periodically operation (such as, per minute or two minutes every) of the slightly rich ground of engine is required for lean-combustion engine, so as to from absorption Device purifies NO_x, to make NO_xTrap regeneration.Since compression ignition engine typically operates under conditions of very thin, Especially under light load, therefore in order to make engine be operated under enrichment condition to purify NO_xTrap needs to be substantially reduced Across the air mass flow of engine, this usually requires to throttle to engine airflow.Regenerative process is also very consumption combustion Material.With purification NO_xThe conventional method of trap is compared, and NO is purified using ignition control is skipped_xTrap will be highly beneficial 's.Skipping the use of ignition control can eliminate to the requirement within the engine with throttle valve, to reduce engine cost And complexity.In other embodiments, skipping the use of ignition control can be used cooperatively with engine throttle with the row of control Temperature degree.

Additionally, although the present invention has generally been described with regard to compression ignition engine, the present invention can also be It is used in spark ignition, spark ignition auxiliary or glow-plug ignition assisted engine.Particularly, present invention can apply to lean-burn fire Spark ignition engine.These engines have some attributes of compression ignition engine, the oxygen in such as exhaust stream, therefore it Can not generally use the conventional after-treatment system based on 3 effect catalyst.In some embodiments, it is not in engine All cylinders are required for deactivate.Relative to the engine for enabling all cylinders to deactivate, this can reduce cost.At some In embodiment, rearrangement is replaced, one or more of operation described by modification or removal.Therefore, the embodiment of the present invention is answered When being considered illustrative and not restrictive, and the present invention is not limited to these details given herein.

Claims (31)

1. a kind of for skip the engine controller that sparking mode operates lean burn ic engine, which to include multiple Operating room, with that can deactivate intake valve or air bleeding valve, which includes for wherein at least one operating room：

Monitor is post-processed, which is arranged to obtain the temperature with the after-treatment component in engine exhaust system Spend relevant data；And

Ignition timing determination unit, the ignition timing determination unit are arranged to determine for operating the hair to skip sparking mode The ignition order at least one operating room that can deactivate intake valve or air bleeding valve of motivation, wherein the ignition order is extremely The after-treatment component temperature data is at least partly based on to generate.

2. engine controller as described in claim 1, wherein the after-treatment component temperature data is from selected from by post-processing What the group of component temperature model and sensed after-treatment component temperature composition obtained.

3. engine controller as described in claim 1, wherein：

The after-treatment component temperature data is obtained from after-treatment component temperature model；And

The after-treatment component temperature model is to be based on one or more selected from the group below, which is made of the following terms：Oxygen passes Sensor data, NO_xSensing data, delivery temperature, environment temperature, across the engine air stream quality, spray combustion Material, the timing of fuel injection, manifold pressure, camshaft location, remaining trapped exhaust gas, EGR gas, ambient humidity, air Pressure and engine coolant temperature.

4. engine controller as described in any one of the preceding claims, wherein the ignition order is by ignition timing Determining.

5. engine controller as described in any one of the preceding claims, wherein the after-treatment component is catalyst.

6. engine controller as claimed in claim 5, wherein the after-treatment component is catalyzed using selective catalytic reduction The catalyst of agent.

7. engine controller according to any one of claims 1 to 4, wherein the after-treatment component is dilute NO_xTrap.

8. engine controller as described in any one of the preceding claims, wherein the lean burn ic engine is to be selected from down One of group, which is made of the following terms：Compressed in layers igniter motor, homogeneous charge compression ignition engine, part are Even charge compression ignition engine and lean-burn spark-ignition engine.

9. engine controller as described in any one of the preceding claims, wherein the engine controller is configured to use In the deactivated operating room farthest away from the after-treatment component in engine starting process.

10. engine controller as described in any one of the preceding claims, wherein the internal combustion engine does not have for controlling System enters the throttle valve of the air stream in these operating rooms.

11. engine controller as described in any one of the preceding claims, wherein the engine controller is configured to use In commanding deactivated associated at least one of the intake valve or air bleeding valve in each be skipped in working cycle process, make in this way No air is obtained to be pumped across the operating room.

12. a kind of for being controlled come after controlling using the igniter motor of skipping of the lean burn ic engine with multiple operating rooms The method of the temperature of element in processing system, this method include：

Obtain the relevant data of temperature with the after-treatment component in exhaust system；And

It determines for skip the ignition order that sparking mode operates these operating rooms of the engine, so that a few thing Room working cycles are skipped and a few thing room working cycles are ignited, wherein the ignition order is based at least partially on this Post-processing temperature data generate.

13. method as claimed in claim 12, wherein the after-treatment component is catalyst.

14. method as claimed in claim 13, wherein the catalyst uses selective catalytic reduction catalysts.

15. method as claimed in claim 12, wherein the after-treatment component is dilute NO_xTrap.

16. method as claimed in claim 12, wherein the after-treatment component is particulate filter.

17. the method as described in claim 12 or 16, wherein the temperature of the after-treatment component temporarily increases so as to actively Ground makes the after-treatment component regenerate.

18. the method as described in any one of claim 12 to 17, wherein the lean burn ic engine is selected from the group below one A, which is made of the following terms：Compressed in layers igniter motor, homogeneous charge compression ignition engine, part homogeneous charge Compression ignition engine and lean-burn spark-ignition engine.

19. the method as described in any one of claim 12 to 18, wherein be skipped in working cycle process, stop selected With these relevant work rooms, so that being skipped in working cycle process at these does not have air to be pumped across these accordingly Operating room.

20. the method as described in any one of claim 12 to 19, wherein be skipped in working cycle process selected, needle The relevant work room is sprayed using late fuel to cause unburned hydrocarbons being introduced into the exhaust system.

21. the method as described in any one of claim 12 to 20, wherein each operating room's working cycles of skipping or light a fire Decision be in the engine during skipping ignition operation in each ignition timing when individually make.

22. a kind of method that cold start-up has the lean burn ic engine of multiple operating rooms, each operating room is arranged with one It is operated in serial continuous work cycle, this method includes：

In selected working cycle process effective discharge mould is reduced with first by deactivating at least one of these operating rooms Formula operates the lean burn ic engine, so that does not have air to be pumped across the phase in these select working cycle process Answer operating room, wherein the lean burn ic engine is operated with the reduction effective discharge pattern, at least up to in the lean-burn Until after-treatment component in the associated exhaust system of burn engine reaches hydrocarbon initiation temperature；

Determine whether the after-treatment component has reached at least hydrocarbon initiation temperature；And

After determining that the after-treatment component has reached at least hydrocarbon initiation temperature, make the engine with actively pre- Heat is skipped fired operating mode and is operated, and having reached at least specified operation temperature at least up to the after-treatment component is Only, wherein during skipping fired operating mode with active preheating and being operated, cause oxygen and unburned nytron Object is sent in the exhaust system, so that at least some of these hydrocarbons by the after-treatment component aoxidize with Just accelerate the preheating of the after-treatment component.

23. method as claimed in claim 22, wherein in the process operated with the first reduction effective discharge pattern In, only physically it is ignited closer to the subgroup of the after-treatment component in the exhaust system in these operating rooms.

24. method as claimed in claim 22, wherein in the process operated with the first reduction effective discharge pattern In, these operating rooms are operated under specified stoichiometric air/fuel ratio.

25. method as claimed in claim 19, wherein using skipping retrofire in the first reduction effective discharge pattern Machine operates.

26. method as claimed in claim 19, wherein be ignited at these and skip at least some of ignition operating cycle In, at least some of these unburned hydrocarbons are introduced by using enriched air/fuel ratio.

27. method as claimed in claim 19, wherein unburned skip at least some of ignition operating cycle at these In, at least some of at least some of these unburned hydrocarbons and excessive oxygen are drawn via late fuel injection Enter.

28. in the particulate filter utilized in a kind of exhaust pathway reducing the lean burn ic engine with multiple operating rooms Soot accumulated method, each operating room be configured for a series of continuous works recycle in operate, this method includes：

In the operating process of the lean burn ic engine, be converted to temporary particulate filter cleaning mode makes in this mode The lean burn ic engine is operable to fully to increase delivery temperature to make the particulate filter to skip ignition mode Temperature fully rise, to aoxidize and thus to remove the soot accumulated on the particulate filter, wherein skipped a little with this During fiery pattern is operated, cause to burn in selected be ignited in working cycles, and cause not in selected quilt It skips in working cycles and burns；

These relevant work rooms are deactivated during these are skipped at least some of working cycles, to prevent air from existing Such be skipped in working cycle process passes through such operating room；And

Wherein, during skipping ignition mode with this under the first effective discharge and being operated, in these operating rooms extremely Few one is skipped and is ignited sometimes sometimes.

29. method as claimed in claim 28, the wherein particulate filter are heated at approximate 500 DEG C to 600 DEG C of model Enclose interior temperature.

30. the method as described in claim 28 or 29, wherein these relevant work rooms are skipped working cycles all these It is deactivated in the process.

31. the method as described in claim 28 or 29, wherein be skipped in some in working cycles at these and utilize the later stage Fuel injection, to cause unburned hydrocarbons to be introduced in the exhaust pathway, wherein these unburned nytrons Object is aoxidized to help to heat the particulate filter.